The calculated distance (air line) between Bayt Lāhyā and Janīn is approximately 79 miles respectively 127 kilometers.
By car or train, the actual journey to Janīn is certainly longer, as only the direct route (as the crow flies) between Bayt Lāhyā and Janīn has been calculated here.
Air line (approximately)
127 kilometers
68 nautical miles